> I would add, that for a long running process, open ended work, or task, I 
> would favor a thread.  But for short and finite items I would favor 
> GCD/NSOperationQueue.  
> 
> Are you going to only load one image, the next image, in this concurrent 
> loading scenario?  Or, will you be loading many images and caching them?  

No, just one (next) image.
That will then get displayed about a minute later, at which point the image 
after that should get prefetched.

> 
> I would imaging looking one or two ahead would be the choice.  

Yes, I am planning to look ahead just one image.
That's why I thought a whole queue might be overdoing it for just one task that 
takes usually just a few milliseconds, and occasionally 1-2 seconds.

But if you say that for such one-off tasks, an NSOperationQueue is better, I'll 
go with that approach.

And thanks a lot to everybody for sharing their insights and hints.


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